is it wrong to feel no one will ever want me

it was in two weeks time of her and i chatting yes i came here as i wasnt sure she was serious about being with me no im not delusional but when i find a girl im really into i fall fast and im a one woman guy if im dating i only date one at a time as im not into poly and i feel it would be cheating i wont date a girl who sees others im not a cheat neither should she however if idate a girl into girls then yes we can add others to the fun